Aquapod Screw on Curved Water Rocket Fin - Compatible with Any 2 Liter Bottles - Makes Bottle Spiral in Air - Fun Educational STEM Toy & Accessory to Water Rocket Launcher

Seems like a cool idea for a gift especially my son who is into science and anything that you can rocket. I haven’t opened it yet it’s for his birthday next month but I will update when I do.

This doesn't work at all because the collar sits at the height of the o ring and pressure can't build in the bottle, it leaks out.

I missed that these were just the fins, not the launcher, so unfortunately, we probably won't be able to enjoy these at all. I simply do not have $40 to spend on a bottle rocket launcher, no matter how cool the idea seems. This set would only be a giftable item if you're prepared to spend $40 on the launcher, or the recipient already has one. Would have been a lot of fun to play with, I'm sure!

You need your own 2 liter bottles! A plug, air tube, air flow for the plug & bike pump/ air pump.

They work well and are sturdy. Good product.

The associated launcher for this is amazing. Unfortunately, these fins fail to deliver. The cylinder that extends below the fins is not long enough to stay on the o-ring of the launcher once it gets above ~20 PSI on our bike pump. The bottles maybe go 75 feet in the air at 20 PSI with these fins. If you pump above that, the pressure pushes the assembly off of the launch pad and it loses its seal, any pressure, and all of the water.There’s another red product with several hundred reviews on Amazon. Using those fins our bottles are going several hundred feet in the air and able to be fully pressurized.

Exactly as described

Have replaced the O ring cleaned,checked for debris these just don't seal ....lose most the water before air is ready. Off brand seems to seal better and fly higher